Issue Area/Project or Alternative/Impact Description

Phase¹

Mitigation Measure

C

A-3 Soil stockpiled for more than two days shall be covered, kept moist, or treated with soil binders to prevent dust generation.

A-4 Trucked soil loads shall be covered using a tarp or other suitable means during transport.

A-5 Maintain a minimum 12-inch freeboard ratio on haul trucks.

A-6 Sweep streets at the end of the day if visible soil material is carried onto adjacent public paved roads.

A-7 For construction in station facilities and for staging areas, install a gravel pad at least 50 feet onto the site from the main road.

A-8 Traffic speeds on all unpaved roads to be reduced to 15 mph or less; restrict speed to 5 mph or less within 100 feet of the entrance to a paved road.

A-9 Dispose of surplus excavated material in accordance with local ordinances.

BIOLOGICAL RESOURCES

C

A

B-5 Plans for topsoil stockpiling prior to trenching shall be created and replacement of topsoil shall take place after construction at the Compton Creek crossing.

B-6 If live trees over 3 inches dbl at the Compton Creek crossing are to be removed, a site-specific vegetation plan shall be prepared.

CULTURAL RESOURCES

• Previously unrecorded cultural resources could be discovered during trenching or excavation.

C

C-2 Complete Phase 2 archaeological testing if a site is found during excavation and resources are not feasibly avoidable. Assess site's significance prior to continuation of excavation. Design test excavations according to parameters in text. Curate all excavated non-burial related artifacts and associated documentation at qualified facility.

C-3 Conduct Phase 3 data recovery investigations if Phase 2 investigations determine that a significant site will be affected. Coordinate with appropriate agencies. Design data recovery plan.

A

ENVIRONMENTAL CONTAMINATION

C

EC-2 Thoroughly review current agency records followed by site-specific visual inspection of the pipeline route by a qualified and approved environmental consultant for "medium potential sites (as listed in Table C.5-3)".

EC-3 Review current agency records of "high" potential sites (as listed in Table C.5-3) to design a investigation program to assess surface waste or debris and underlying soil.

C

EC-5 SFPP shall perform contaminated site record searches for the Watson Station, Industry Station, and the Colton Terminal, and provide search results to the DTSC and CPUC.

C

C

GEOLOGY

O

HYDROLOGY

C

A

H-4 SFPP shall use a thicker walled pipe (wall thickness of at least 0.500 inches) and/or concrete coated pipe at the Compton Creek crossing (if this crossing is not bored) in order to protect the pipe from external damage. Such pipe and/or coating shall extend at least 10 feet outside of the levee walls, or within 5 feet of the valves on either side of the crossing.

OR:

H-5 Bore Compton Creek crossing to a depth of at least 10 feet below the channel bottom.

A

C

C

N-2 Provide at least 72-hour advance notice of the start of construction to all business and residences adjacent to the ROW. (implement with Mitigation Measures L-1 through L-3).

N-3 Establish a toll-free telephone number for receiving questions or complaints during construction and develop procedures for responding to callers. The number shall be included in the mailed notification (Mitigation Measure N-2) and implemented with Mitigation Measures L-1 through L-3.

N-4 Maintain proper mufflers on all internal combustion and vehicle engines used in construction to reduce noise to the maximum feasible extent. SFPP shall maintain written certification of muffler condition and make it available upon request to CPUC-approved construction monitor.

C

N-5 Install a temporary, solid plywood barrier between the construction zone and the southern boundary of Norwalk Station to reduce offsite noise levels to the residences adjacent to the station. The barrier should be of sufficient height and width to shield the residences from the construction noise.

• Lane closures and heavy equipment traffic could impede access to businesses along the project route.

C

S-2 SFPP shall compensate any business disrupted, displaced, or forced to relocate due to the construction or operation of the proposed project.

C

SS-16 from Section C.11, System Safety and Risk Upset.

A

C

C

A

SYSTEM SAFETY

None.

C

T-2 SFPP shall develop detailed Traffic Control Plans (TCPs) for the entire pipeline route at all locations where construction activities would interact with the existing transportation system.

C

T-4 SFPP shall give written notification to all landowners, tenants, business operators, and residents along the ROW of the construction schedule, and shall explain the exact location and duration of the pipeline and construction activities within each street .

T-5 SFPP shall schedule construction on or adjacent to sensitive land uses (hospitals, schools, residences, major employers, recreational areas, etc.) so that at least one access driveway is left unblocked during all business hours or hours of use.

C

C

C

T-9 SFPP shall provide a shuttle bus service for construction workers from convenient off-street parking areas to the work sites to minimize traffic volumes and parking demand at the work sites. Sufficient off-street parking shall be provided at the bus service staging areas so that adjacent or nearby parking facilities are not adversely affected.

C

C

A

A

C

C